Swedish researchers discovered the devastating disease is six times more prevalent among victims of a traumatic brain injury (TBI).
The findings, derived from data of 995,000 people, is the biggest investigation of its kind into the link between TBIs and dementia.
It showed the more severe the blow, the greater the risk of the incurable disease, according to the analysis led by Umea University.
The results, welcomed by charities, add to the mounting concerns about the dangers of head injuries from playing football, rugby, boxing and American football.
Studies have repeatedly uncovered links between dementia and blows to the head, such as those sustained from contact sports.
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